 /*******************************************************************************
  * Copyright (c) 2005, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.resources.mapping;

 import java.util.*;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.runtime.*;

 /**
  * A resource mapping that obtains the traversals for its model object
  * from a set of child mappings.
  * <p>
  * This class is not intended to be subclasses by clients.
  *
  * @since 3.2
  */
 public final class CompositeResourceMapping extends ResourceMapping {

     private final ResourceMapping[] mappings;
     private final Object modelObject;
     private IProject[] projects;
     private String providerId;

     /**
      * Create a composite mapping that obtains its traversals from a set of sub-mappings.
      * @param modelObject the model object for this mapping
      * @param mappings the sub-mappings from which the traversals are obtained
      */
     public CompositeResourceMapping(String providerId, Object modelObject, ResourceMapping[] mappings) {
         this.modelObject = modelObject;
         this.mappings = mappings;
         this.providerId = providerId;
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.mapping.ResourceMapping#contains(org.eclipse.core.resources.mapping.ResourceMapping)
      */
     public boolean contains(ResourceMapping mapping) {
         for (int i = 0; i < mappings.length; i++) {
             ResourceMapping childMapping = mappings[i];
             if (childMapping.contains(mapping)) {
                 return true;
             }
         }
         return false;
     }

     /**
      * Return the resource mappings contained in this composite.
      * @return Return the resource mappings contained in this composite.
      */
     public ResourceMapping[] getMappings() {
         return mappings;
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.mapping.ResourceMapping#getModelObject()
      */
     public Object getModelObject() {
         return modelObject;
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.mapping.ResourceMapping#getModelProviderId()
      */
     public String getModelProviderId() {
         return providerId;
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.mapping.ResourceMapping#getProjects()
      */
     public IProject[] getProjects() {
         if (projects == null) {
             Set result = new HashSet();
             for (int i = 0; i < mappings.length; i++) {
                 ResourceMapping mapping = mappings[i];
                 result.addAll(Arrays.asList(mapping.getProjects()));
             }
             projects = (IProject[]) result.toArray(new IProject[result.size()]);
         }
         return projects;
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.mapping.ResourceMapping#getTraversals(org.eclipse.core.internal.resources.mapping.ResourceMappingContext, org.eclipse.core.runtime.IProgressMonitor)
      */
     public ResourceTraversal[] getTraversals(ResourceMappingContext context, IProgressMonitor monitor) throws CoreException {
         if (monitor == null)
             monitor = new NullProgressMonitor();
         try {
             monitor.beginTask("", 100 * mappings.length); //$NON-NLS-1$
 List result = new ArrayList();
             for (int i = 0; i < mappings.length; i++) {
                 ResourceMapping mapping = mappings[i];
                 result.addAll(Arrays.asList(mapping.getTraversals(context, new SubProgressMonitor(monitor, 100))));
             }
             return (ResourceTraversal[]) result.toArray(new ResourceTraversal[result.size()]);
         } finally {
             monitor.done();
         }
     }

 }

